250W UHF Transmitter/Repeater - UBS Ltduniquesys.com/wp-content/uploads/pdfs/980_DTX-2500... · Note: MIBs are provided CLI ... 250W UHF Transmitter/Repeater (specifications are subject

250W UHF Transmitter/Repeater Model: DTX 2500U

Unique Broadband Systems Ltd.

Product Description

Product Features

The DTX 2500U is a compact, solid-state transmitter, designed for

digital terrestrial television broadcasting over a UHF frequency range

of 470 MHz to 860 MHz.

Using the latest technology, the DTX 2500U converts an input transport

stream (MPEG-2, CMMB Multiplex or ISDB-T/TB Multiplex) to a COFDM

or 8VSB modulated RF signal. UBS has developed a Direct Digital

Synthesis (DDS) process that allowing the Universal Modulator board

to provide the amplifier portion of the transmitter with an RF signal.

The modulator board RF output is amplified to a digital average out-

put power level of 250 Watts by a highly efficient power amplifier, built

using LD-MOS transistor technology. The power level stability at the

transmitter’s RF output is maintained by an internal automatic level

control loop.

The PA employs its own microcontroller, which monitors the operation

parameters of the PA, provides protection against abnormal operation

conditions and communicates with the system controller.

The Adaptive Pre-corrector is a superior pre-distortion solution that com-

pensates for RF Power Amplifier non-linearities including AM/AM and

AM/PM distortion and protects against IMD and spectral regrowth while

maximizing EVM performance.

Wireless Broadband and Broadcasting Solutions

•470MHz-860MHzBroadbandTransmitter/Repeater

•LDMOS Power Amplifier provides 250 Watt outputfor ATSC, ATSC-M/H, CMMB, DTMB, DVB-T/H, DVB-T2,DVB-SH,ISDB-T/TB,,DAB,DAB+andT-DMBwaveforms

•SFNandMFNsupport

•AdaptiveNon-linearPre-corrector

•ManualLinearandNon-linearDigitalPre-correctors

•Touchscreendisplayforrealtimeuserinterface

•Remote control and self monitoring via Ethernet andRS485interfaces

•BuiltinwebserveraccessiblethroughEthernetconnectorwithInternetExplorer

•RemotelymanageableviaSNMP

•GbETransportStreamInputbasedonPro-MPEGForumCoP#3/SMPTE2022

•Occupyingonly3RUofstandard19”cabinetspace

The manual Linear and Non-linear Digital Pre-correctors can also be used

to maximize transmitter performance.

With the addition of an integrated DVB-S/S2 Receiver, the DTX 2500U

can be configured as a terrestrial repeater. The input data stream is re-

ceived and re-broadcast as a COFDM or 8VSB waveform.

The transmitter’s operational parameters are monitored and controlled

by an embedded system controller that can be accessed from the front

panel touch screen LCD or by using one of the remote control interfaces

(Ethernet, SNMP, USB or RS232).

Optionally, the DTX 2500U RS232 interface can be dedicated for commu-

nication with a 3rd party UPS. In this case, the transmitter is configured

with an extra set of SNMP parameters and will actively monitor the UPS.

All of the transmitter’s components are enclosed in a standard 19” rack

mount chassis, occupying only 3 “RU” of cabinet space. The transmitter is

forced air cooled using two compact high performance fans, which are

installed on the transmitter enclosure front panel.

Optional Features

•IntegratedGPSorGPS/GLONASSReceiver

•IntegratedDVB-S/S2Receiver

•AdaptiveLinearandNon-linearDigitalPre-correctors

(specifications are subject to change without notice) Document 56983-UNIV-S07-09 October 17, 2013


250W UHF Transmitter/RepeaterModel: DTX 2500U

Wireless Broadband and Broadcasting SolutionsWireless Broadband and Broadcasting Solutions

Block Diagram


Control Interfaces



Web Interface

Touch Screen LCD





Product Specifications

Power Amplifier RF OutputRF Output Connector 7/16 DIN-type (F), 50 Ω

Operating Frequency Range 470 MHz - 860 MHz (Note 2)

Frequency Setting Accuracy 1 Hz step over entire operation range

Frequency Stability 1ppm internal, or in accordance with external GPS accuracy

Digital Average Output Power 250 Watts

Output Power Set Point Range 10 dB

Output Power Level Accuracy ≤ ±0.25 dB

Output Level Stability vs. time ≤ ±0.25 dB/24 hrs max.

In-band IMD ≤ -29 dBc

Spectral Regrowth ≤ -32 dBc (at rated output power, without pre-correction)≤ -40 dBc (at rated output power, with adaptive non-linear pre-correction)

Output Spurious Level ≤ -60 dBm

Output Harmonics ≤ -60 dBc (with output filter)

Out-of-Band Emissions Compliant to FCC Part 27 [27.50(F)] requirements when using external mask filter

RF Monitor Connector: SMA (F), 50 ΩLevel: 53 dB below the RF output

Note 2: The DTX 2500U is designed to support the entire UHF range of 470 MHz to

860 MHz, however, each DTX 2500U is factory configured and aligned to operate on a

specific RF channel. The RF output frequency is indicated on a label placed near the RF

output connector and it is also displayed on the control modulator front panel.

Administrative access is required to change the frequency through the Web Interface.

Note 1: The “10MHz” and “1PPS” are inputs, except in the units equipped with internal

GPS receivers, where they become Monitoring Outputs (high impedance).


Modulator InputsDVB-ASI IN-A, IN-B 2 DVB-ASI inputs: BNC (F), 75 Ω

SMPTE-310M IN-A, IN-B 2 inputs (optional): BNC (F), 75 Ω

GbE Transport Stream(DAB and DVB-T2 excluded)

Protocol: Pro-MPEG CoP #3 / SMPTE 2022Connector: RJ45

HPA FB SMA (F), 50 ΩLevel: -15 dBm to 0 dBm

Clock Reference - 10 MHz(Note 1)

Connector: BNC (F)Frequency: 10 MHzLevel: 0 dBm to 15 dBmImpedance: 50 Ω

Time Reference - 1 PPS(Note 1)

Connector: BNC (F)Frequency: 1 PPSLevel: TTLTrigger: Positive transitionImpedance: 50 Ω

Modulator OutputsDVB-ASI OUT-A, OUT-B 2 DVB-ASI outputs: BNC (F) 75 Ω

Modulator RF Monitor Connector: SMA (F), 50 ΩLevel: 30 dB below RF output

Clock Reference - 10 MHz(Note 1)

Connector: BNC (F), High ImpedanceFrequency: 10 MHzLevel: 10 dBm, ± 2.5 dB sinewave

Time Reference - 1 PPS(Note 1)

Connector: BNC (F), High ImpedanceFrequency: 1 PPSLevel: TTLTrigger: Positive transition

(specifications are subject to change without notice)

Rear Panel

Document 56983-UNIV-S07-09 October 17, 2013

Product Specifications



Power SupplyVoltage 100 - 240 VAC

Frequency 50/60 Hz

Power Consumption max. 1500 Watts

Fuse 15A, 250V @ 110 VAC10A, 250V @ 240 VAC

MechanicalSize 3 U of 19” wide cabinet

Dimensions (W x H x D) 48.26 cm x 13.28 cm x 63.88 cm (19” x 5.23” x 25.15”)

Weight 22 kg (48.5 lbs.)

EnvironmentalOperating Temperature 0° C to +50° C (+32° F to +122° F)

Storage Temperature -30° C to +70° C (-22° F to +158° F)

Relative Humidity max. 95%, non condensing

Cooling Forced air


Note 3: Greater improvement is possible under particular applications. Performance

depends upon power level and waveform.

Control InterfacesFront Panel Touch screen LCD

Ethernet Interface Connector: 2x RJ45Speed: 10/100/1000 Base-T

USB Interface Connector: USB Type B

RS232 Interface Connector: 9-pin SUB-D Male

RS485 Interface 2 Connectors: 9-pin SUB-D FemaleThe modulator RS485 interfaceis used for control of the amplifier

Web Interface Internet Explorer, Firefox, etc.Connector: Ethernet

SNMP Control Interface Connector: Ethernet Note: MIBs are provided

CLI (Command Line Interface)

Connector: USB (HyperTerminal) or Ethernet (HyperTerminal and Telnet)

Alarm Relays Connector: RS2322 Dry Contact Alarm relays, triggered by any major alarm.


Manual Digital Pre-CorrectionNon-Linear Pre-Correction

Curve Formats S 21 and VO/VI

Amplitude Scale Linear and Logarithmic

Correction Points Max. 256, user-defined position

Spectral RegrowthReduction

Max. 12 dB, subject to available headroom

Phase Correction -6 to +30 degrees, subject to available headroom

Linear Pre-Correction

Correction Points 61

Point Spacing 1/60 of nominal spectrum BW

Amplitude Correction ±10 dB

Amplitude Resolution 0.01 dB

Group Delay Correction ±2000 ns

Group Delay Resolution 1 ns

Peak Power Clip Level +17 dB to +7 dB(peak power relative to average RMS level)

Adaptive Non-linear Pre-correctionHPA FB Connector Connected to the PA output monitoring port

when the Adaptive Pre-corrector is used

Frequency 470 MHz to 860 MHz

Spectral Regrowth Reduction

7 dB ±2 dB (Note 3)


Product Specifications for Optional Features



GPS ReceiverInput Connector F-type (F), 75 Ω

5 Vdc biased

Recommended Antenna Bullet III GPS antenna - Trimble model no. 57860-10 or equivalent

Receiver Architecture L1 1575.42 MHz

12 Parallel Channels C/A code (1.023 MHz chip rate)Code plus carrier tracking (carrier aided tracking)

Tracking Capability 12 simultaneous satellite vehicles

Acquisition Time(Time To First Fix, TTFF)

< 15 seconds typical TTFF-hot (with current almanac, position, time and ephemeris)< 150 seconds typical TTFF-cold (no stored information)

Positioning Accuracy < 5 m, 1 - sigma< 10 m, 2 - sigma

Timing Accuracy < 2 ns, 1 - sigma< 6 ns, 6 - sigma

Holdover Time ±1 usec during 2 hours

10 MHz Output Signal Internally connected to the modulator inputLevel: 10 dBm ±2.5 dBm, sine waveHarmonic Level: -40 dBc max.Phase Noise: 1 Hz: < -75 dBc/Hz 10 Hz: < -110 dBc/Hz 100 Hz: < -125 dBc/Hz 1 kHz: < -135 dBc/Hz 10 kHz: < -155 dBc/Hz 100 kHz: < -155 dBc/Hz

1PPS Output Signal Internally connected to the modulator inputLevel: TTL

Model: DTX 2500U250W UHF Transmitter/Repeater


GPS/GLONASS ReceiverInput Connector F-type (F), 75 Ω

5 Vdc biased

Recommended Antenna Bullet III GPS antenna - Trimble model no. 57860-10 or equivalent

Receiver Architecture L1 - 1575.42 MHz / GLONASS - L1 frequency range

32 Parallel Channels GPS C/A code (1.023 MHz chip rate) / GLONASS PT code - WASS / EGNOSCode plus carrier tracking (carrier aided tracking)

Tracking Capability 24 simultaneous satellite vehicles

Acquisition Time(Time To First Fix, TTFF)(Tested at –40ºC to +85ºC)

< 15 s typical TTFF-hot (with current almanac, position, time and ephemeris)< 40 s typical TTFF-warm (with current almanac, position, time)< 150 s typical TTFF-cold (No stored information)

Positioning Accuracy GPS: < 10m / 20mGLONASS: < 10 m / 20m

Timing Accuracy

1 PPS + 10 MHz

< 100 ns

Holdover Time ≤ 2.5 µsec during 2 hours

10 MHz Output Signal Internally connected to the exciter inputLevel: 10 dBm ±2.5 dBm, sine waveHarmonic Level: -30 dBc max.Phase Noise: 1 Hz: < -75 dBc/Hz 10 Hz: < -110 dBc/Hz 100 Hz: < -125 dBc/Hz 1 kHz: < -135 dBc/Hz 10 kHz: < -155 dBc/Hz 100 kHz: < -155 dBc/Hz

1PPS Output Signal Internally connected to the exciter inputLevel: TTL






DVB-S/S2 Receiver InputInput Connector F-type (F), 75 Ω

Frequency Range 950 MHz - 2150 MHz

Input Signal Level -65 dBm to -25 dBm

LNB Voltage 12 to 18 VDC

LNB Current Two selectable output current limits: 450 mA / 750 mA

LNB Communication Integrated DisEqC controller

Data Rate Up to 45 Mbaud

DVB-S Demodulation and DecodingDVB-S EN 300 421

Constellation QPSK

Outer FEC Reed Solomon

Inner FEC Viterbi

Code Rate 1/2, 2/3, 3/4, 5/6, 6/7, 7/8

Roll Off 0.35

DVB-S2 Demodulation and DecodingDVB-S2 EN 302 307

Constellation QPSK, 8PSK

Outer FEC-BCH nldpc = 64800 (Long)

Inner FEC-LDPC QPSK - 1/2, 3/5, 2/3, 3/4, 4/5, 5/6, 8/9, 9/108PSK - 3/5, 2/3, 3/4, 5/6, 8/9, 9/10

DVB Modes CCM (Constant Coding and Modulation)

Roll OFf 0.20, 0.25, 0.35

Pilot Processing Yes

DVB-S/S2 Transport Stream OutputReceiver ASI Out (1, 2) Connector: 2x BNC (F), 75 Ω

The DVB-S/S2 receiver ASI output connector (1 or 2) must be connected to the DVB-ASI input connector (IN A or IN B).

Product Specifications for Optional Features


Documents

250W UHF Transmitter/Repeater - UBS Ltduniquesys.com/wp-content/uploads/pdfs/980_DTX-2500... · Note: MIBs are provided CLI ... 250W UHF Transmitter/Repeater (specifications are subject